<template>
  <div id="app">
    <div class="box"></div>
    <p>i love u</p>
  </div>
</template>

<script>
export default {}
</script>

<style lang="scss">
#app {
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #ffffff;
  .box {
    width: 100%;
    max-width: 540px;
    height: 50px;
    background: red;
    position: fixed;
    bottom: 0;
  }
}
</style>
